/Engine/Source/Runtime/Engine/Classes/Engine/ProxyLODMeshSimplificationSettings.h
Controls the system used to generate proxy LODs with merged meshes (i.e. the HLOD system).
class UProxyLODMeshSimplificationSettings : public [UDeveloperSettings](API\Runtime\DeveloperSettings\Engine\UDeveloperSettings)
FName
ProxyLODMeshReductionModuleName
Mesh reduction plugin to use when simplifying mesh geometry for Hierarchical LOD